IPA: /sɪˈkriːtɪvli/
KK: /sɪˈkrɛtɪvli/
In a way that is done quietly and without others knowing, often to keep something hidden.
She secretively glanced at the surprise party preparations without anyone noticing.
Secretively → It is formed from "secret" (from Latin "secretus", meaning hidden or concealed) and "-ively" (meaning in a manner of). The word "secretively" means in a manner that is hidden or concealed.
Think of something that is 'hidden' ('secret') and done 'in a manner' ('-ively') — that's why secretively means doing something in a hidden way.